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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/hr °C
kcal/m² hr °C
kcal/m hr °C

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Stanton number
Peclet number
Nusselt number
Biot number

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal conductivity
Temperature gradient
Thermal coefficient
Thermal resistance

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Planck's law
Wien's law
Kirchhoff's law
Stefan's law

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Convection
Radiation
Free convection
Forced convection

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

66.7°C
20°C
60°C
40°C

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MORE MCQ ON Heat and Mass Transfer

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